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Multicolored Keyless Entry System
mollyhackit writes "Here's a how-to guide for building a keyless entry that uses color identification instead of numbers. All eight buttons are initially blue; as you press the individual buttons they change color. Cycle the colors to your particular pattern, and you're in. This lock obviously wasn't designed for high security use since anyone in the same room would be able to see you and your amazing technicolor dream lock's pattern; it's just a fun project and will keep the youngins out of your workshop (timer prevents brute forcing). The RGB buttons are monome clones from hobby shop Sparkfun."
I'm red-green colour blind.
Many of the PopCap games (and similar) I have played where colour is significant have overlays shown (as an option) which aid me just fine, and I'm sure a similar thing would work here, even though that's assuming that the original would be unusable by someone colour blind.
The one thing that really used to irritate me was Teletext (before it faded into obsolescence) - Being unable to tell the difference between Green and Yellow, and Cyan and White made for trying times, especially when some insensitive clod chose green and yellow as two of the "fastext" colours. Oh, and chose blue for the cyan option (which looks white to me!).
I have no problem wiring a plug; only occasional problems wiring more complex items (whereby I am forced to use direct lighting to make the colour distinctions); and no problem with traffic lights. Only where I must choose between two shades that differ by red hue alone (or near enough) do I have problems. I know that red-green colour blindness is not the only kind, but it often feels like colour blindness is not considered when designing new products/websites etc. and I find that disappointing for lack of such a simple consideration.